public class Test {
    public static void main(String[] args) {
        int a = 10;
        int c = 20;
        System.out.println("a == " + a);//10
        System.out.println("c == " + c);//20
        System.out.println("a + c == " + a + c);//1020
        System.out.println("a + c == " + (a + c));//30
        System.out.println(a + c + " == a + c");//30
        System.out.println((a + c) + " == a + c");//30
    }
}
